Mold structure, blowing needle, blowing device and method for manufacturing pressure vessel liner

Abstract

The application discloses a mold structure, a blowing needle, a blowing device and a pressure container liner manufacturing method. The mold structure is used for manufacturing a pressure container liner in a blowing process and comprises six pressure forming parts from top to bottom. The first pressure forming part is used for forming a riser extension part of the pressure container. The second pressure forming part is used for forming a riser part of the pressure container. The third pressure forming part is used for forming a material containing part of the pressure container. The fourth pressure forming part is used for forming a flanging part of the pressure container. The fifth pressure forming part is used for forming a neck part of the pressure container. The sixth pressure forming part is used for forming a body of the pressure container. The application can produce pressure containers with various inner diameters, and can form a production identification mark in the pressure container during the production process, thereby reducing the production difficulty of the pressure container and improving the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water treatment, in particular to a mold structure, a blowing needle, a blowing device and a method for manufacturing a pressure vessel liner of a water-related equipment. BACKGROUND

[0002] The blowing process is a processing technology for plastic hollow forming, which can form a plastic blank in a molten state into the shape of the inner cavity of the mold. The traditional blowing process mainly consists of five steps: 1 blanking (extrusion of hollow plastic tube blank); 2 the mold with the cavity is closed, and the plastic blank is cut off; 3 pressure air is blown into the mold through the blowing needle, and the pressure is maintained for a certain time; 4 open the mold, unload the formed parts; 5 remove the blowing needle, trim the flash to get the finished product.

[0003] With the improvement of people's living standards, water-related products are more and more widely used by families, especially water heater products, which have become a necessary choice for home use. The water storage unit of the water heater is generally welded with metal sheet material, and the inside is blocked by enamel. However, during continuous use, there are still problems such as weld leakage, corrosion, and scaling. The solid particles generated by these problems will gradually increase and accumulate, leading to defects such as reduced thermal efficiency of the water heater, yellowish water quality, and reduced water output, ultimately leading to the scrap of the water heater or affecting the use of customers. Especially the problem of thermal efficiency reduction, which will produce more energy consumption, under such a wide popularization rate of products, a little bit of energy consumption means exponential waste of energy, which cannot be ignored.

[0004] The inner liner made of metal material not only has many defects in the use process, but also has the problem of excessive energy consumption in the production process (the enamel process is a super high temperature forming), which is contrary to the "double carbon" goal of the country, so it is imperative to adopt new alternative materials.

[0005] Due to the above reasons, a composite material pressure vessel resistant to high temperature is a good alternative solution, but the traditional composite material pressure vessel needs to be improved in structure to be applied to the water heater. For example, the composite material pressure vessel is connected to the water heater through a connecting piece. This requires the production of non-standard pressure vessels with various inner diameters to meet the needs of connecting the water heater, and the non-standard pressure vessels need to provide a connecting structure for the heating pipe assembly, support the connecting piece, and realize the sealing and pressure strength required for production.

[0006] However, the existing blowing process has the following technical defects in the manufacture of pressure vessels, which need to be solved;

[0007] 1. It is difficult to form a pressure vessel liner with a uniform caliber and various inner diameters and uniform wall thickness;

[0008] 2. It is impossible to manufacture positioning points inside the pressure vessel during blow molding production. The positioning points need to be manufactured in another process. In addition, the manufacturing process of positioning points inside the pressure vessel after molding is difficult and the manufacturing efficiency is low.

[0009] 3. The existing connector support structure of the pressure vessel liner cannot be formed in one step during blow molding, nor can it be produced using dedicated production tools. Summary of the Invention

[0010] The Summary of the Invention introduces a series of simplified concepts, which are simplifications of existing technologies in the field and are further described in detail in the Detailed Description of the Invention. The Summary of the Invention is not intended to define the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0011] The technical problem to be solved by the present invention is to provide a mold structure, a blow needle, a blow molding device and a method for manufacturing a pressure vessel liner that can produce pressure vessel liners of various inner diameters, and can form the liner connector support knot (the neck and flange part of the present invention) and production identification mark in one go during the blow molding production process.

[0012] In order to solve the above technical problems, the present invention provides a mold structure for manufacturing a pressure vessel liner by a blow molding process;

[0013] It is divided into six pressure-forming parts from top to bottom;

[0014] A first pressure-formed portion 1, which is used to form a riser extension portion 7 of a pressure vessel;

[0015] The riser extension 7 is formed by extending upward from the riser portion 8 of the pressure vessel; the riser extension 7 of the pressure vessel is a portion removed after the pressure vessel is formed. The purpose of designing the riser extension 7 is to ensure that the flange of the inner liner is formed full, flat, and free of defects.

[0016] A second pressure-molded portion 2, which is used to form a riser portion 8 of the pressure vessel;

[0017] A third pressure-molded portion 3, which is used to form a material-containing portion 9 of the pressure container;

[0018] The material receiving portion 9 is used to provide space for the excess material to flow during extrusion production;

[0019] a fourth pressure-formed portion 4, which is used to form a flange portion 10 of the pressure vessel;

[0020] flanging part 10, which is formed as a platform extending from the lower part of the material containing part 9 into the pressure container, the top surface of the platform being used to make a production identification mark; the production identification mark is used to position a connecting hole formed later in the inner container, and the connecting hole is used to connect and fix the heating pipe assembly;

[0021] a fifth pressure forming part 5, which is used to form a neck part 11 of the pressure container;

[0022] a neck part 11, which is used to accommodate an external connecting insert;

[0023] a sixth pressure forming part 6, which is used to form a body 12 of the pressure container.

[0024] Optionally, the mold structure is further improved, and the inner diameter of the fifth pressure forming part 5 < the inner diameter of the second pressure forming part 2 < the inner diameter of the first pressure forming part 1 < the inner diameter of the third pressure forming part 3.

[0025] Optionally, the mold structure is further improved, and the production identification mark includes a positioning part and / or a cutting part;

[0026] The positioning part is used to identify the position of a subsequent machining structure;

[0027] The cutting part is used to identify the reserved part and the removed part of the subsequent machining.

[0028] Optionally, the mold structure is further improved, and the positioning part includes a positioning hole, a positioning recess or a positioning protrusion;

[0029] The cutting part includes the boundary line between the flanging part and the extending part.

[0030] Optionally, the mold structure is further improved to form a two-piece structure.

[0031] To solve the above technical problems, the present application provides a blow needle used in cooperation with the mold structure, which has an air channel formed therein and includes: a needle tail 13 and five forming parts divided from top to bottom;

[0032] The first forming part 14 cooperates with the first pressure forming part 1 to form the riser extending part 7;

[0033] The second forming part 15 cooperates with the top of the second pressure forming part 2 to close the mold inner cavity and cut off the blank;

[0034] The third forming part 16 cooperates with the second pressure forming part 2 to form the riser part 8, and cooperates with the third pressure forming part 3 to form the material containing part 9;

[0035] The fourth forming part 17 cooperates with the fourth pressure forming part 4 to form the flanging part 10, and the production identification mark manufacturing part is formed on the contact surface of the flanging part 10;

[0036] Fifth forming part 18, which is a fifth pressure forming part 5, is used to form the neck 11 of the pressure container.

[0037] Optionally, the blow pin of the mold structure is further improved, and the fourth forming part 17 is pressed in the vertical direction to form the production identification mark manufacturing part.

[0038] To solve the above technical problems, the present application provides a blow molding device with the mold structure and the blow pin, further comprising:

[0039] The driving mechanism is connected to the pin tail, which is used to drive the blow pin to insert or separate from the mold structure;

[0040] The controller is used to control the driving mechanism device stroke and the external air source to the blow pin.

[0041] To solve the above technical problems, the present application provides a pressure container liner manufacturing method using the blow molding device, comprising the following steps:

[0042] S1, push the blow pin into the mold cavity;

[0043] S2, material blanking, the length of the material blank exceeds the mold cavity;

[0044] S3, mold closing, the second forming part 15 is in contact with the top of the second pressure forming part 2, the mold cavity is closed and the material blank is cut off, and the gas is blown in immediately after the mold closing is completed;

[0045] S4, pressure maintaining, in this process, the fourth forming part 17 and the fourth pressure forming part 4 are filled with material batch blank;

[0046] S5, pressure relief;

[0047] S6, pull out the blow pin from the mold cavity, and the pressure container remains on the blow pin;

[0048] S7, mold opening, take out the liner together with the blow pin.

[0049] The technical scheme provided by the present application can at least achieve the following technical effects:

[0050] 1. Whether it is a rotational molding process or a blow molding process, it is a single-sided forming process, although it can form the flange part and the neck part of the liner, but it cannot well constrain the size and shape retention of the two parts, so it cannot have good cooperation.

[0051] The existing blow molding process, the first, it is difficult to think of using the change of blow pin structure to extrude the flange and neck features, second, because the flange insert is a whole, the plastic blank in the traditional blow molding process can not pass through the inner diameter of the flange insert. Therefore, it is difficult to think of using blow molding process to produce the liner with flange and neck features. Third, because of the first two ideas, it is difficult to think that the flange insert can be separated into two parts, wrapped outside the formed neck, and then strengthened by winding layer to maintain a high degree of pressure capacity, or think of one or two of the above three points, still cannot imagine how to use blow molding process to produce pressure vessel liner with flange and neck structure. Therefore, there is still no application of such technology so far.

[0052] The mold structure, blow pin and blow molding device of the present application can form a pressure vessel liner with flange and neck structure in one blow molding process. The present application combines extrusion and blow molding by designing the blow pin structure to form the mouth of the blow molded part by extrusion molding. Further, the neck and flange features of the liner are formed with uniform wall thickness, flatness and stable size, so that they can be well matched when cooperating with the counterpart. The flange and neck structure produced by the present application has uniform wall thickness, flatness and stable and controllable size; and a production identification mark can be formed on the top surface of the flange during production, which reduces the difficulty of producing the pressure vessel liner and improves the production efficiency. The neck of the pressure vessel liner can be used to connect the insert (such as the flange insert) from the outside. This structure can solve the problem that the traditional composite pressure vessel threaded port and water heater heating pipe cover cannot be directly connected.

[0053] 2、In the present application, the inventor further considers the characteristics of blow molding process and possible molding defects, and introduces the riser feature: on the basis of the required flange feature, the riser feature is further extended outward. The riser feature also includes a material containing area, so that during the extrusion of the blow pin and the mold, after the flange feature is fully extruded, the excess material can flow to the material containing area, avoiding the problem that the material has no place to go, resulting in the inability to close the mold.

[0054] 3、The mold structure, blow pin and blow molding device of the present application can directly form a production identification mark inside the pressure vessel liner during blow molding production. Compared with the prior art of manufacturing production identification mark inside the pressure vessel liner from the outside after blow molding, the present application reduces the production difficulty, omits the additional process step of manufacturing production identification mark from the outside to the inside of the pressure vessel liner, and improves the production efficiency.

[0055] 4、The pressure vessel liner manufactured by the mold structure, the blowing needle and the blowing device of the present application can fill the space between the flange and the neck of the barrel by connecting the external insert (such as a flange insert), support the flange, and improve the stability of the connection.

[0056] 5、The prior art cannot design the thickness of the flange alone, because the pressure in the mold is the same at all positions during blowing production, and the prior art can only form a pressure vessel liner with uniform thickness. However, the present application can control the thickness of the flange by designing the distance between the fourth forming part and the fourth pressure receiving forming part according to the needs. BRIEF DESCRIPTION OF DRAWINGS

[0057] The drawings of the present application are intended to show the general characteristics of the methods, structures and / or materials used in the specific exemplary embodiments according to the present application, and to supplement the description in the specification. However, the drawings of the present application are not to scale and may not accurately reflect the precise structure or performance characteristics of any given embodiment, and the drawings of the present application should not be interpreted as limiting or restricting the scope of values or attributes encompassed by the exemplary embodiments according to the present application. The present application is further described in detail below in conjunction with the specific embodiments and the accompanying drawings:

[0058] Figure 1 is a schematic diagram of the structure of the first embodiment of the present application

[0059] Figure 2 is a schematic diagram of the structure of the first embodiment of the present application

[0060] Figure 3 is a schematic diagram of the structure of the second embodiment of the present application

[0061] Figure 4 is a schematic diagram of the structure of the second embodiment of the present application

[0062] Figure 5 is a schematic diagram of the structure of the second embodiment of the present application

[0063] BRIEF DESCRIPTION OF DRAWINGS

[0064] First pressure receiving forming part 1

[0065] Second pressure receiving forming part 2

[0066] Third pressure receiving forming part 3

[0067] Fourth pressure receiving forming part 4

[0068] Fifth pressure receiving forming part 5

[0069] Sixth pressure receiving forming part 6

[0070] Riser extension 7

[0071] Riser portion 8

[0072] Material receiving portion 9

[0073] Flange portion 10

[0074] Neck portion 11

[0075] Body 12

[0076] Second hand tail 13

[0077] First shaped portion 14

[0078] Second shaped portion 15

[0079] Third shaped portion 16

[0080] Fourth shaped portion 17

[0081] Positioning portion 19.1

[0082] Cutting portion 19.2.

[0083] Driving mechanism 20

[0084] Blow pin 21

[0085] Mold structure 22

[0086] Inner liner 23. DETAILED DESCRIPTION

[0087] The other advantages and technical effects of the present application can be fully appreciated by those skilled in the art from the disclosure of the present specification. The present application can also be implemented or applied in different specific embodiments, and the details in the present specification can be applied based on different viewpoints, with various modifications or changes made without departing from the general design idea of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. The exemplary embodiments of the present application described below can be implemented in various different forms, and should not be interpreted as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided in order to make the disclosure of the present application complete and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. It should be understood that when an element is referred to as being "connected" or "coupled" to another element, the element can be directly connected or coupled to the other element, or there can be an intermediate element. Different is that when an element is referred to as being "directly connected" or "directly coupled" to another element, there is no intermediate element. In all the drawings, the same reference signs always represent the same elements.

[0088] First embodiment

[0089] Reference Figure 1 CombinationFigure 2 As shown, the present application provides a mold structure for manufacturing pressure vessel inner liner in blow molding process, comprising:

[0090] which is divided into six pressure forming parts from top to bottom;

[0091] The first pressure forming part 1 is used to form the riser extension 7 of the pressure vessel;

[0092] The riser extension 7 is formed upward from the riser part 8 of the pressure vessel;

[0093] The second pressure forming part 2 is used to form the riser part 8 of the pressure vessel;

[0094] The third pressure forming part 3 is used to form the material containing part 9 of the pressure vessel;

[0095] The material containing part 9 is used to provide space for the flow of excess material during production extrusion;

[0096] The fourth pressure forming part 4 is used to form the flange part 10 of the pressure vessel;

[0097] The flange part 10 is formed as a platform extending from the lower part of the material containing part 9 into the pressure vessel, and the top surface of the platform is used to make production identification marks; reference Figure 4 As shown, from the top of the pressure vessel to the bottom, the production identification marks on the flange part 10

[0098] The neck part 11 is used to accommodate external connecting inserts;

[0099] The fifth pressure forming part 5 is used to form the neck part 11 of the pressure vessel;

[0100] The sixth pressure forming part 6 is used to form the body 12 of the pressure vessel;

[0101] Wherein, the inner diameter of the fifth pressure forming part 5 > the inner diameter of the first pressure forming part 1 ≥ the inner diameter of the second pressure forming part > the inner diameter of the fourth pressure forming part.

[0102] Figure 2 Only part of the upper body of the pressure vessel is drawn, and the lower body is omitted, but the lower body is not the improvement part of the present application, so only part of the body is shown.

[0103] Optionally, the production identification marks include positioning parts and / or cutting parts;

[0104] The positioning part 19.1 is used to identify the position of subsequent machining structure, such as positioning hole for identifying the hole position when drilling

[0105] The cutting part 19.2 is used to identify the reserved part and the removed part of subsequent machining, such as cutting line.

[0106] Alternatively, the mold structure is formed as a two-part structure.

[0107] Furthermore, it should be understood that although the terms "first", "second", etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of example embodiments of the application.

[0108] A second embodiment;

[0109] Referring to Figure 3 In conjunction Figure 2 As shown, the present application provides a blow pin used in cooperation with the mold structure of the first embodiment, which has an air channel formed therein, and is divided into a pin tail 13 and five forming portions from top to bottom;

[0110] A first forming portion 14, which cooperates with the first pressure forming portion 1 to form the riser extension 7;

[0111] A second forming portion 15, which cooperates with the top of the second pressure forming portion 2 to close the mold cavity and cut off the blank;

[0112] A third forming portion 16, which cooperates with the second pressure forming portion 2 to form the riser portion 8, and cooperates with the third pressure forming portion 3 to form the material containing portion 9;

[0113] A fourth forming portion 17, which cooperates with the fourth pressure forming portion 4 to form the flange portion 10, and has a production identification mark manufacturing portion formed on the contact surface of the flange portion 10;

[0114] A fifth forming portion 18, which cooperates with the fifth pressure forming portion 5 to form the neck portion 11 of the pressure vessel;

[0115] Among them, the fourth forming portion 17 is pressed in the vertical direction to the fourth pressure forming portion 4 to form the production identification mark manufacturing portion.

[0116] A third embodiment;

[0117] Referring to Figure 5 As shown, the present application provides a blow molding device of the mold structure of the first embodiment and the blow pin of the second embodiment, further comprising:

[0118] A driving mechanism 20 connected to the pin tail 13, which is used to drive the blow pin 21 to insert or separate from the mold structure 22;

[0119] A controller (not shown) is used to control the driving mechanism 20 and the amount of air supplied to the blow pin.

[0120] A fourth embodiment;

[0121] The present application provides a method for manufacturing a liner of a pressure vessel using the blow molding device of the third embodiment, comprising the following steps:

[0122] S1, the blow pin is pushed into the mold cavity by the driving mechanism, at this time the mold is in an open state;

[0123] S2, the blank is cut, the blank is a circular ring-shaped material, and the length of the blank exceeds the mold cavity;

[0124] S3, the mold is closed, the second forming part 15 is in contact with the top of the second pressure receiving forming part 2, the inner cavity of the mold is closed, and the blank is cut off, and immediately after the mold is closed, the gas is blown in;

[0125] S4, pressure maintaining, the mold body has a cooling water channel, which can realize rapid cooling of the mold; during this process, the fourth forming part 17 and the fourth pressure receiving forming part 4 are filled with the blank;

[0126] S5, pressure releasing, after the pressure is released, the liner will quickly shrink, and the surface of the liner is separated from the mold. If there is no support, the degree of shrinkage is uncontrollable, but the flange part and the neck part have good dimensional stability because of the support of the blow pin;

[0127] S6, the blow pin is pulled out of the mold cavity, and the pressure vessel remains on the blow pin;

[0128] S7, the mold is opened, and the liner is taken out together with the blow pin. Because the blow pin has been separated from the liner, the operator can easily separate the liner and the blow pin, and obtain the formed liner (which still has a sprue) at this time. According to the requirements, subsequent machining is performed.

[0129] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0130] The application has been described in detail by specific embodiments and examples, but these do not constitute a limitation on the application. Those skilled in the art can also make many modifications and improvements without departing from the principles of the application, and these should also be considered as within the scope of protection of the application.

Claims

1. A blow pin used in cooperation with a mold structure, characterized in that: the mold structure is used to manufacture a pressure vessel liner in a blow molding process, and is divided into six pressure forming sections from top to bottom; a first pressure forming section (1) is used to form a riser extension (7) of the pressure vessel liner; the riser extension (7) is formed upward from a riser section (8) of the pressure vessel liner; a second pressure forming section (2) is used to form the riser section (8) of the pressure vessel liner; a third pressure forming section (3) is used to form a material containing section (9) of the pressure vessel liner; the material containing section (9) is used to provide a space for the flow of excess material during production extrusion; a fourth pressure forming section (4) is used to form a flange section (10) of the pressure vessel liner; the flange section (10) is formed as a platform extending from the lower part of the material containing section (9) into the pressure vessel liner, and the top surface of the platform is used to make a production identification mark; a fifth pressure forming section (5) is used to form a neck section (11) of the pressure vessel liner; the neck section (11) is used to accommodate an external connecting insert; a sixth pressure forming section (6) is used to form a body (12) of the pressure vessel liner; the blow pin has an air channel formed inside, and includes: a needle tail (13) and five forming sections divided from top to bottom; a first forming section (14) cooperates with the first pressure forming section (1) to form the riser extension (7); a second forming section (15) cooperates with the top of the second pressure forming section (2) to close the mold cavity and cut off the material blank; a third forming section (16) cooperates with the second pressure forming section (2) to form the riser section (8), and cooperates with the third pressure forming section (3) to form the material containing section (9); a fourth forming section (17) cooperates with the fourth pressure forming section (4) to form the flange section (10), and has a production identification mark manufacturing part formed on the contact surface of the flange section (10); a fifth forming section (18) cooperates with the fifth pressure forming section (5) to form the neck section (11).

2. A blow pin for use with a mold structure as defined in claim 1, wherein: The inner diameter of the fifth pressure forming section (5) < the inner diameter of the second pressure forming section (2) < the inner diameter of the first pressure forming section (1) < the inner diameter of the third pressure forming section (3).

3. A blow pin for use with a mold structure as defined in claim 1, wherein: The production identification mark includes a positioning part and / or a cutting part; the positioning part is used to identify the position of the subsequent machining structure; the cutting part is used to identify the reserved part and the removed part of the subsequent machining.

4. A blow pin for use with a mold structure as defined in claim 1 wherein: The mold is formed as a two-piece structure.

5. The blow pin for use with a mold structure of claim 1 wherein: The fourth forming section (17) is pressed vertically against the fourth pressure forming section (4) to form the production identification mark manufacturing part.

6. A blow molding apparatus comprising a mold structure and the blow pin of claim 1 used in cooperation with the mold structure, characterized in that, Further comprising: a driving mechanism connected to the needle tail, used to drive the blow pin to insert or separate from the mold structure; a controller used to control the stroke of the driving mechanism device and the air supply amount of the external air source to the blow pin.

Images